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Its place usually represents the degree of accuracy of the number. The only exception (that I can think of) is when the last digit is 0 and it is there only for conventional reasons - for example money values being given to 2 digits after the decimal point.

Q: What does the last significant digit represent?

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you take the last digit in the first one and add/subtract it to the last digit in the second one and that is your answer

Five. Count from the first nonzero digit to the last nonzero digit.

All digits between the first non-zero digit and the last non-zero digits are significant. Some would argue that trailing 0s are significant since they are an indication of the precision of the number.

As trailing zeros after a decimal point make no difference to the value of a number and are not normally written but 0.08240 does have one written, the trailing zero must be significant. Counting form the first non-zero digit to the last significant digit (inclusive) there are 4 sig fig.

5. Count the number of digits from the first non-zero digit to the last non-zero digit.

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When the last digit of a significant digit is 5, you always round up.

The last digit indicates the degree of significance.

The number whose farthest right significant digit determines it. Whatever place that digit is in is the last significant digit in the sum. For example: 433 + 150 + 3.67 + 8000 = 8586.67, but in sig figs this is only 9000, as the thousands digit is the lowest digit that can be represented.

you take the last digit in the first one and add/subtract it to the last digit in the second one and that is your answer

Five. Count from the first nonzero digit to the last nonzero digit.

All digits between the first non-zero digit and the last non-zero digits are significant. Some would argue that trailing 0s are significant since they are an indication of the precision of the number.

All digits between the first non-zero digit and the last non-zero digits are significant. Some would argue that trailing 0s are significant since they are an indication of the precision of the number.

As trailing zeros after a decimal point make no difference to the value of a number and are not normally written but 0.08240 does have one written, the trailing zero must be significant. Counting form the first non-zero digit to the last significant digit (inclusive) there are 4 sig fig.